Elegant scrolling control

Hallo,

I have a problem, I needed a somewhat more customizable way to choose
different labels out of two lists (select various ones, etc.), so I
implemented my own kind of dual listbox, by using Flowpanel in a
Scrollpanel, which have special types of labels, that can be set to
marked. It also has a key handler to move the selection, and it's
created following MVP.
So everything works perfectly, only that now after the request of key
handling came up, and the key handling is implemented, the panel is
not scrolling, when I leave the bottom, typing down (I need only
scrolling down and up, not left and right)... Naturally I want it to
scroll accordingly to keep the last selection change always in the
visible area. (just like listbox does)
Just that somehow I don't see a clean solution to accomplish that. I'm
sure I could somehow set the scrolling manually, but I don't know on
how to keep track when I leave the visible area with my cursor.
Because the panel is completely variable in size, I can't really say
"after ten times clicking down I will leave the visible area". I would
need a way to check if the selected widget (of which I have a hold in
my presenter) is still fully visible. And if not to determine how to
change the scrolling (I take it there is an option to manually scroll
a ScrollPanel without using the scroll bar).

Does anyone know how to achieve that in the cleanest way? WIthout
breaking MVP preferably?

Many thanks for any suggestion :-)

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